fx Coding Agent Review 2026: A Tiny, Open, Native Harness in Zig
The fx coding agent is Vercel Labs’ experimental coding-agent harness and CLI, written in Zig and open sourced under Apache-2.0 in August 2026. It ships as a single native binary of roughly 6.2 MiB on Apple Silicon — no Node.js, no Python, no node_modules — and drives four interfaces (shell CLI, one-shot JSON, an ACP server, and a WebAssembly SDK) from one agent core. As of 2026-10-01 it is at 3,237 GitHub stars, v0.0.12, and is still explicitly labeled experimental with breaking changes between releases. ...